Automotive Multimeter
Contents
1. Gl REL MAXMIN Pmax Pmin gt Ohms resistance continuity Hertz frequency Volts Percent lt J OoOzZzTmna gt 33 oy a REL Relative unused in this model AC Alternating current DC Direct current MAX Highest reading MIN Lowest reading F Degrees Fahrenheit C Degrees Centigrade Pmax Maximum peak Pmin Minimum peak RPM Rotations per minute Trig Positive or Negative Trigger CYL Cylinder 4 5 6 and 8 H Display Hold x10 Multiply displayed reading by 10 ll Bargraph Manual range top left on LCD AUTO Auto range mode iC Auto Power OFF icon middle left on LCD N Dwell angle icon 6 AUT500 EU EN v1 0 5 13 Operating Instructions WARNING Risk of electrocution High voltage circuits both AC and DC are very dangerous and should be measured with great care 1 ALWAYS turn the function switch to the OFF position when the meter is not in use 2 If OL appears in the display during a measurement the value exceeds the range selected Change to a higher range NOTE On some low AC and DC voltage ranges with the test leads not connected to a device the display may show a random changing reading This response is normal and is caused by the high input sensitivity The reading will stabilize and give a proper measurement when connected to a circuit DC VOLTAGE MEASUREMENTS CAUTION Do not measure DC voltages if a motor on the circuit is being switched ON or OFF Large voltage2. 18 AUT500 EU EN v1 0 5 13
3. To avoid electric shock never measure continuity on circuits or wires that have voltage on them a Set the function switch to the Q position Refer to the Resistance measurement diagram above for reference 2 Insert the black lead banana plug into the negative COM jack Insert the red test lead banana plug into the positive Q jack 3 Press the MODE button to indicate on the display 4 Touch the test probe tips to the circuit or wire you wish to check 5 If the resistance is less than approximately 35Q the audible signal will sound If the circuit is open the display will indicate OL DIODE TEST 1 Set the function switch to the Q position 2 Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the positive V jack 3 Press the MODE button to indicate and V on the display 4 Touch the test probes to the diode under test Forward voltage will typically indicate 0 400 to 0 700V Reverse voltage will indicate OL Shorted devices will indicate near OV and an open device will indicate OL in both polarities CONTACT TEMPERATURE MEASUREMENTS TYPE K 1 2 3 Note The temperature probe is fitted with a type K mini connector A Set the function switch to the Type K C or F position Insert the Temperature Probe into the input jacks making sure to observe the correct polarity Touch the Temperature Probe tip to the part under test
4. and MIN readings in the background To view MAX and MIN readings again press the MAX MINI button again to view MAX and again to view MIN 7 To exit the MAX MIN mode press and hold the MAX MIN button for 2 seconds The MAX and MIN indicators will switch OFF AUTO POWER OFF The Auto Power OFF utility will turn the meter off after 30 minutes of inactivity LOW BATTERY INDICATION The icon indicates battery strength Replace the batteries promptly when the battery symbol shows low battery capacity 13 AUT500 EU EN v1 0 5 13 Specifications Function Range Resolution Accuracy DC Voltage 400mV 0 1mV 0 5 reading 3 digits 4V 0 001V 40V 0 01V 1 5 reading 2 digits 400V 0 1V 600V 1V 1 8 reading 2 digits AC Voltage 50 to 60Hz 400mV 0 1mV 1 5 reading 5 digits 4V 0 001V 1 0 reading 3 digits 40V 0 01V 1 5 reading 3 digits 400V 0 1V 600V 1V 2 0 reading 4 digits DC Current 400uA 0 1uA 4000A IRA 1 5 reading 3 digits 40mA 0 01mA 400mA 0 1mA 4A ants 2 5 reading 5 digits 20A 0 01A AC Current 50 to 60Hz 40mA 0 01mA 1 8 reading 5 digits 400mA 0 1mA 20A 0 01A 3 0 reading 7 digits Resistance 4002 0 12 1 2 reading 4 digits 4kQ 0 001kQ 1 0 reading 2 digits 40kQ 0 01kQ 400kQ 0 1kQ 1 2 reading 2 digits 4MQ 0 001MQ 40MQ 0 01MQ 2 0 readin
5. is displayed on the negative slope Add a jumper cable between the fuel injector and the harness connector 5 Connect the black test lead to a good ground at the fuel injector or the negative vehicle battery post Connect the red test lead to the fuel injector solenoid driver input on the jumper cable from step 4 Start the engine Read the pulse size in milliseconds on the display Note Initially the meter will read OL over range and then readings will descend and stabilize to the actual pulse width If OL remains on the meter display re check the connections and test setup DWELL MEASUREMENTS 1 Set the rotary function switch to the DWELL position 2 Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive DWELL jack 3 Touch the test leads to the breaker points wire red test lead and to a good ground black test lead Select the number of engine cylinders 4 5 6 or 8 using the RANGE button 5 Read dwell angle in degrees on the LCD RPM MEASUREMENTS 1 Set the rotary function switch to the RPM or the x10 RPM position Use the x10 position for readings 1000 to 12000 RPM 2 Connect the supplied magnetic clamp pickup to the meter by inserting the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive RPM jack 3 Clamp the magnetic pickup around the spark plug wire to sense secondary ignition impulses 4 R
6. surges may occur that can damage the meter 1 Set the function switch to the V position 2 Press the MODE button to indicate DC on the display 3 Insert the black test lead banana plug into the negative COM jack Insert the red test lead banana plug into the positive V jack 4 Touch the black test probe tip to the negative side of the circuit Touch the red test probe tip to the positive side of the circuit 5 Read the voltage in the display as numerical digits and as bar graph representation 7 AUT500 EU EN v1 0 5 13 AC VOLTAGE MEASUREMENTS WARNING Risk of Electrocution The probe tips may not be long enough to contact the live parts inside some 240V outlets for appliances because the contacts are recessed deep in the outlets As a result the reading may show 0 volts when the outlet actually has voltage on it Make sure the probe tips are touching the metal contacts inside the outlet before assuming that no voltage is present CAUTION Do not measure AC voltages if a motor on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter 1 Set the function switch to the V position 2 Press the MODE button to indicate AC on the display 3 Insert the black test lead banana plug into the negative COM jack Insert red test lead banana plug into the positive V jack 4 Touch the black test probe tip to the neutral side of the circuit Touch the red test pr
7. the meter before opening the case Do not operate the meter with an open case This instrument is designed to provide years of dependable service if the following care instructions are performed 1 KEEP THE METER DRY If it gets wet wipe it off 2 USE AND STORE THE METER IN NORMAL TEMPERATURES Temperature extremes can shorten the life of the electronic parts and distort or melt plastic parts 3 HANDLE THE METER GENTLY AND CAREFULLY Dropping it can damage the electronic parts or the case 4 KEEP THE METER CLEAN Wipe the case occasionally with a damp cloth DO NOT use chemicals cleaning solvents or detergents 5 USE ONLY FRESH BATTERIES OF THE RECOMMENDED SIZE AND TYPE Remove old or weak batteries so they do not leak and damage the unit 6 IF THE METER IS TO BE STORED FOR A LONG PERIOD OF TIME the batteries should be removed to prevent damage to the unit BATTERY REPLACEMENT 1 Remove the Phillips head screw at the center back of the meter that secures the rear battery compartment door 2 Open the battery compartment 3 Replace the 9V battery 4 Secure the battery compartment You as the end user are legally bound EU Battery ordinance to return all used batteries disposal in the household garbage is prohibited You can hand over your used batteries accumulators at collection points in your community or wherever batteries accumulators are sold Disposal Follow the valid legal stipulations in res
8. EXTECH USER GUIDE INSTRUMENTS Automotive Multimeter MODEL AUT500 CE Introduction Thank you for selecting the Extech AUT500 Automotive Multimeter The AUT500 is an Auto Range Multime ter that measures AC DC Voltage AC DC Current Resistance Capacitance Frequency Diode Continuity RPM Dwell and Duty Cycle The AUT500 also measures contact temperature via supplied Thermocouple probe The AUT500 features a rugged design for heavy duty use This device is shipped fully tested and calibrated and with proper use will provide years of reliable service Please visit our website www extech com to check for the latest version of this User Guide Product Updates and Customer Support Safety International Safety Symbols A A E This symbol adjacent to another symbol or terminal indicates the user must refer to the manual for further information This symbol adjacent to a terminal indicates that under normal use hazardous voltages may be present Double insulation This WARNING symbol indicates a potentially hazardous situation which if not avoided could result in death or serious injury CAUTION This CAUTION symbol indicates a potentially hazardous situation which if not avoided may result damage to the product MAX This symbol advises the user that the terminal s so marked must not be 600V connected to a circuit point at which the voltage with respect to earth ground exce
9. When the reading stabilizes after approximately 30 seconds remove the probe tip from the surface under test Read the temperature in the display as numerical digits and as bar graph representation mini connector to banana connector adaptor is supplied for connection to the meter s input banana jacks 10 AUT500 EU EN v1 0 5 13 CAPACITANCE MEASUREMENTS WARNING To avoid electric shock disconnect power to the unit under test and discharge all capacitors before taking any capacitance measurements Remove the batteries and unplug the line cords 1 Set the rotary function switch to the 4 position 2 Insert the black test lead banana plug into the negative COM jack Insert the red test lead banana plug into the positive 4 jack 3 Touch the test leads to the capacitor to be tested 4 Read the capacitance value in the display note that the bar graph is inactive in Capacitance mode FREQUENCY MEASUREMENTS 1 Set the rotary function switch to the Hz position 2 Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive Hz jack 3 Touch the test probe tips to the circuit under test Read the frequency on the display DUTY CYCLE 1 Set the rotary function switch to the position 2 Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive jack 3 For Trigger options press the RANGE ke
10. ead the RPM on the display When using the x10 mode multiply the reading by a factor of 10 RPM Measurement notes e f no signal is detected unclamp the pickup from the spark plug wire and re clamp around the spark plug wire in the opposite direction e Position the pickup so it is 6 inches from the spark plug If no signal is detected or if an erratic signal is detected try another spark plug wire e Position the magnetic pickup as far from the distributor and exhaust manifold as possible 12 AUT500 EU EN v1 0 5 13 AUTORANGING MANUAL RANGE SELECTION When the meter is first turned on it automatically uses Auto Range mode This automatically selects the best range for the measurements being made and is generally the best mode for most measurements For measurement situations requiring that a range be manually selected perform the following 1 Press the RANGE key The AUTO display indicator will turn off and the symbol will appear on the upper left hand corner of the LCD 2 Now momentary presses of the RANGE key steps through the available ranges until the desired range is selected 3 To exit the Manual Range mode and return to the Auto Range mode press and hold the RANGE key for 2 seconds The circular Manual Range symbol will switch OFF and AUTO will reappear on the left side of the LCD Note Manual Range does not apply for the Capacitance Frequency and Temperature functions DISPLAY BACKLIGHT Press the backlight key
11. eds in this case 600 VAC or VDC CAUTIONS Improper use of this meter can cause damage shock injury or death Read and understand this user manual before operating the meter Always remove the test leads before replacing the battery or fuses Inspect the condition of the test leads and the meter itself for any damage before operating the meter Repair any damage or replace the unit before use Use great care when making measurements if the voltages are greater than 25VAC rms or 35VDC These voltages are considered a shock hazard Always discharge capacitors and remove power from the device under test before performing Diode Resistance or Continuity tests Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the recessed electrical contacts Other means should be used to ensure that the terminals are not live 2 AUT500 EU EN v1 0 5 13 If the equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired This device is not a toy and must not reach children s hands It contains hazardous objects as well as small parts that the children could swallow In case a child swallows any of them please contact a physician immediately Do not leave batteries and packing material lying around unattended they can be dangerous for children if they use them as toys In case the device is going to be unused for an extended p
12. eds 600V above earth ground 4 NEVER connect the meter leads across a voltage source while the function switch is in the current resistance or diode mode Doing so can damage the meter 5 ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance or diode tests 6 ALWAYS turn off the power and disconnect the test leads before opening the covers to replace the fuse or batteries 7 NEVER operate the meter unless the back cover and the battery and fuse covers are in place and fastened securely 4 AUT500 EU EN v1 0 5 13 Controls and Jacks 1 LCD display 7 Backlight button 2 MODE button 8 Function switch 3 HOLD button 9 20A input jack 4 RANGE button 10 400mA input jack 5 PEAK button 11 Positive input jack 6 MAX MIN button 12 COM input jack Note Tilt stand test lead holders and battery compartment are located on rear of unit Fuses are accessible by removing the meter s back cover instructions provided later in this guide EXTECH INSTRUMENTS lt 7 an an aa 2 5 4 7 11 10 Ecom 12 5 AUT500 EU EN v1 0 5 13 Symbols and Annunciators Continuity Diode test ion Battery status E E E ri E T E E E Trig nano 10 capacitance x10 micro 10 amps cap IE l T IE IE numF milli 10 volts amps milli seconds ms abate Mk Q Hz Amps kilo 10 ohms uana aik Farads capacitance mega 10 ohms
13. elements e reading This is the accuracy of the measurement circuit e digits This is the accuracy of the analog to digital converter 15 AUT500 EU EN v1 0 5 13 GENERAL SPECIFICATIONS Compliance Insulation Overvoltage Display Polarity Over range Measurement rate Diode Test Continuity Check Temperature Sensor Fuses Power Low Battery Indication Auto Power OFF Operating conditions Storage conditions Indoor use only Pollution degree Dimensions Weight IEC 1010 1 EN61010 1 Class 2 Double Insulation CAT III 1000V CAT IV 600V 4000 count LCD with multifunction indicators Automatic negative polarity OL display 2 readings per second Test current of 1mA typical open circuit voltage 3V DC typical Audible signal will sound if the resistance is less than 35Q Type K thermocouple with mini jack and banana jack adaptor supplied 400mA range 0 5A 250V fast blow 20A range 20A 250V ceramic fast blow One 1 9V battery NEDA 1604 Battery symbol indicates battery power status Meter switches OFF after 30 minutes of inactivity 0 C to 50 C 32 F to 122 F lt 70 RH 20 C to 60 C 4 F to 60 F lt 80 RH 2000m 7000ft elevation maximum 2 182 x 82 x 55mm 7 2 x 3 2 x 2 2 375g 13 2 oz 16 AUT500 EU EN v1 0 5 13 Maintenance WARNING To avoid electrical shock disconnect the meter from any circuit remove the test leads from the input terminals and turn OFF
14. eriod of time remove the batteries to prevent them from training Expired or damaged batteries can cause cauterization on contact with the skin Always therefore use suitable hand gloves in such cases See that the batteries are not short circuited Do not throw batteries into the fire DANGERS Engines produce carbon monoxide which is odorless causes slower reaction time and can lead to serious injury When the engine is operating keep service areas well ventilated or attach the vehicle exhaust system to the shop exhaust removal system Set the parking brake and block the wheels before testing or repairing the vehicle It is especially important to block the wheels on front wheel drive vehicles the parking brake does not hold the drive wheels Wear an eye shield when testing or repairing vehicles Keep the meter away from spark plug and coil wires Exceeding the limits of this meter is dangerous This will expose you to serious or possibly fatal injury Carefully read and understand the cautions and the specification limits of this meter Avoid electrical shock do not touch the test leads tips or the circuit under test Do not try a voltage measurement with the test leads in the 20A or the mA terminal Choose the proper range and function for the measurement Do not try voltage or current measurements that may exceed the ratings marked on the Function Range switch or terminal When measuring current connect the meter in series w
15. et the function switch to the mA position and insert the red test lead banana plug into the 400mA jack 3 For current measurements up to 20A AC set the function switch to the 20A range and insert the red test lead banana plug into the 20A jack Press the MODE button to indicate AC on the display 5 Remove power from the circuit under test then open up the circuit at the point where you wish to measure current 6 Touch the black test probe tip to the neutral side of the circuit Touch the red test probe tip to the hot side of the circuit Apply power to the circuit Read the current in the display as numerical digits and as bar graph AJ representation RESISTANCE MEASUREMENTS WARNING To avoid electric shock disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements Remove the batteries and unplug the line cords Set the function switch to the Q position 2 Insert the black test lead banana plug into the negative COM jack Insert the red test lead banana plug into the positive Q jack 3 Press the MODE button to indicate Q on the display Touch the test probe tips across the circuit or part under test It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with the resistance reading coea 5 Read the resistance in the display 9 AUT500 EU EN v1 0 5 13 CONTINUITY CHECK WARNING
16. g 3 digits Capacitance 4nF 1pF 5 0 reading 50 digits 40nF 10pF 5 0 reading 7 digits 400nF 0 1nF Aur ink 3 0 reading 5 digits 40uF 10nF DS 400uF 0 1uF 4mF 0 001mF 10 0 reading 10 digits 40mF 0 01mF Temp 30 to 1000 C 1 C 3 0 reading 5 C or 8 F type K 22 to 1832 F 1 F probe accuracy not included Pulse Width 1 0 to 20 0ms 0 1ms 2 0 reading 20 digits Diode 1 0mA test 1mV resolution 5 0 reading 15 digits Continuity Audible threshold 35Q Test Current lt 1mA DC typical 14 AUT500 EU EN v1 0 5 13 Function Range Resolution Accuracy Frequency 4 000Hz 0 001Hz 1 5 reading 5 digits 40 00Hz 0 01Hz 400 0Hz 0 1Hz 4 000MHz 0 001kHz 1 2 reading 2 digits 40 00MHz 0 01kHz Sensitivity gt 5V RMS up to 40MHz and gt 15 VRMS over 40MHz Duty Cycle 0 5 to 99 9 0 1 2 0 reading 5 digits Pulse width 100ps to 100ms Frequency 5Hz to 100kHz Sensitivity gt 5V RMS RPM 4 600 to 4000 RPM 1 RPM tachometer 1000 to 12000 x10 RPM 10 RPM ae E RPM 2 DIS 300 to 4000 RPM 1 RPM P12 0 reading taigis 1000 to 6000 x10 RPM 10 RPM Effective Reading gt 600V DWELL ANGLE 4 CYL 0 to 90 0 ea O t0720 0 1 2 0 reading 4 digits 6 CYL 0 to 60 0 Tra 8 CYL 0 to 45 0 NOTES Accuracy is stated at 18 C to 28 C 65 F to 83 F and less than 75 RH Accuracy specifications consist of two
17. ith the load Never connect more than one set of test leads to the meter Disconnect the live test lead before disconnecting the common test lead The mA and the 20A terminals are protected by fuses To avoid possible injury or damage use only in circuits limited to 400mA 3 AUT500 EU EN v1 0 5 13 OVERVOLTAGE CATEGORY III This meter meets the IEC 610 1 2001 standard for OVERVOLTAGE CATEGORY III Cat IIl meters are protected against overvoltage transients in fixed installation at the distribution level Examples include switches in the fixed installation and some equipment for industrial use with permanent connection to the fixed installation METER SAFETY RULES This meter has been designed for safe use but must be operated with caution The rules listed below must be carefully followed for safe operation 1 NEVER apply voltage or current to the meter that exceeds the specified maximum Input Protection Limits Function Maximum Input Voltage DC or V AC Ohms Continuity Diode Capacitance Type K Temperature 600V AC or DC Frequency Duty Pulse ms Dwell RPM mA AC DC 400mA 250V 20A AC DC 20A AC or DC 20A measurements for 30 seconds maximum Notes Resistance Ohms cannot be measured if voltage is present Resistance can only be measured on a non powered circuit 2 USE EXTREME CAUTION when working with high voltages 3 DO NOT measure voltage if the voltage on the COM input jack exce
18. momentarily to switch the backlight ON or OFF Use the backlight feature sparingly to conserve battery energy DISPLAY HOLD The hold function freezes the reading in the display Press the HOLD key momentarily to activate or to exit the HOLD function The H HOLD icon is visible when the meter is in the HOLD mode PEAK HOLD The Peak Hold function captures the peaks lowest and highest up to 1 millisecond in duration for AC DC Current or Voltage 1 Press the PEAK button momentarily and the Pmax display icon will appear The meter is now displaying captured peaks highest The display will only change when a higher peak is detected 2 Press the PEAK button again and the Pmin display icon will appear The meter is now capturing the lowest peaks 3 Press and hold the PEAK button for 2 seconds to exit the Peak Hold mode Pmax and Pmin icons should switch OFF MAX MIN MEMORY The meter can hold the higheset reading MAX and the lowest reading MIN encountered over the lenghth of any given measurement session 4 Press the MAX MIN momentarily the MAX indicator will appear The meter is now showing the highest reading and will only update when a higher reading is sensed 5 Press the MAX MIN button again to view the lowest reading MIN icon switches ON 6 Press the MAX MIN button again and the MAX MIN icons will both switch ON and will be flashing on and off The display is now showing real time measurements but is monitoring MAX
19. obe tip to the hot side of the circuit 5 Read the voltage in the display as numerical digits and as bar graph representation DC CURRENT MEASUREMENTS CAUTION Do not make current measurements on the 20A scale for longer than 30 seconds Exceeding 30 seconds may cause damage to the meter and or the test leads 1 Insert the black test lead banana plug into the negative COM jack 2 For current measurements up to 400mA DC set the function switch to the mA position and insert the red test lead banana plug into the 400mA jack 3 For current measurements up to 20A DC set the function switch to the 20A range and insert the red test lead banana plug into the 20A jack 4 Press the MODE button to indicate DC on the display 5 Remove power from the circuit under test then open up the circuit at the point where you wish to measure current 6 Touch the black test probe tip to the negative side of the circuit Touch the red test probe tip to the positive side of the circuit Apply power to the circuit Read the current in the display as numerical digits and as bar graph representation 8 AUT500 EU EN v1 0 5 13 AC CURRENT MEASUREMENTS CAUTION Do not make current measurements on the 20A scale for longer than 30 seconds Exceeding 30 seconds may cause damage to the meter and or the test leads Insert the black test lead banana plug into the negative COM jack 2 For current measurements up to 400mA AC s
20. pect of the disposal of the device at the end of its lifecycle WARNING To avoid electric shock do not operate the meter until the battery cover is in place and fastened securely NOTE If the meter does not work properly check the fuses and batteries to make sure that they are still good and that they are properly inserted 17 AUT500 EU EN v1 0 5 13 REPLACING THE FUSES WARNING To avoid electrical shock disconnect the meter from any circuit remove the test leads from the input terminals and turn OFF the meter before opening the case Do not operate the meter with an open case 6 Disconnect the test leads from the meter and from any device under test Remove the four Phillips screws on the rear of the meter 2 at the top edges and two at the middle edges of the meter Gently pull the meter s rear cover off of the meter to access the fuses Gently remove the old fuse from its holder and install the new fuse into the same holder Always use a fuse of the proper size and value 0 5A 250V fast blow for the 400mA range 20A 250V fast blow for the 20A range Re assemble the meter by replacing and secure the rear cover with the screws WARNING To avoid electric shock do not operate the meter until the fuse cover is in place and fastened securely Copyright 2013 FLIR Systems Inc All rights reserved including the right of reproduction in whole or in part in any form ISO 9001 Certified www extech com
21. y momentarily to select TRIG or TRIG in the display 4 Touch the test probe tips to the circuit under test black to ground and red to positive circuit point 5 Read the duty cycle on the display A common automotive application for Duty Cycle is a Mixture Control Solenoid The meter can display the percentage of time the solenoid s plunger is in the closed position low duty cycle during one cycle 11 AUT500 EU EN v1 0 5 13 ms PULSE Pulse Width in milliseconds Pulse width is the length of time an actuator is energized For example fuel injectors are activated by an electronic pulse from the Engine Control Module ECM The pulse generates a magnetic field that pulls the injector s nozzle valve open The pulse ends and the injector nozzle is closed This open to close time is the pulse width and it is measured in milliseconds ms The most common automotive application for measuring pulse width is fuel injection The pulse width of the fuel mixture control solenoid and the idle air control motor can be measured The next measurement section describes how to measure pulse width on port fuel injectors PULSE WIDTH MEASUREMENT EXAMPLE 1 Set the rotary function switch to the ms PULSE position 2 Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive ms jack 3 Press the RANGE key momentarily to select TRIG in the display the applied time for most fuel injectors
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